Prince William holds Prince George as Catherine, Duchess of Cambridge looks on during a visit to the Bilby Enclosure at Sydney’s Taronga Zoo

Prince William holds Prince George as Catherine, Duchess of Cambridge looks on during a visit to the Bilby Enclosure at Sydney’s Taronga Zoo

Prince William holds Prince George as Catherine, Duchess of Cambridge looks on during a visit to the Bilby Enclosure at Sydney’s Taronga Zoo April 20, 2014. The Prince and his wife Kate are undertaking a 19-day official visit to New Zealand and Australia with their son George. REUTERS/Chris Jackson/Pool (AUSTRALIA – Tags: ROYALS ENTERTAINMENT SOCIETY)